In this video, we'll check out some rare germanium transistors that have a very special failure mode; tin whiskers!
NASA study: https://nepp.nasa.gov/whisker/anecdote/af114-transistor/index.html
Discussion from UK Vintage Radio forum: https://www.vintage-radio.net/forum/showthread.php?t=5058&
Mark Hennessy's article: http://www.markhennessy.co.uk/articles/vintage_transistors.htm